import java.math.BigInteger;
import java.util.*;
public class p1023 
{
	public static void main(String[] args) 
	{
		Scanner cin = new Scanner(System.in);
		int n;
		while(cin.hasNext())
		{
			n=cin.nextInt();
			BigInteger t= BigInteger.valueOf(1);
			for(int i=2;i<=n;i++)
			{
				int a=4*i-2;
				t=t.multiply(BigInteger.valueOf(a)).divide(BigInteger.valueOf(i+1));
			}
			System.out.println(t);
		}
	}
}
